Process of manufacturing glycerin and alkali soaps



Patented M5126, A

LUDWIG scrmrnr, or acumen, Gmmm.

rnocnss or nniuracrunme emccnnm annnnxanrsoars.

'11 6 Drawing.

7 To whom it may cmcern:

Be it known that I,'LUnw1c Scnfimr, re-

siding at- Munich, Germany, acitizen of l solvent.

Germany, have invented certain new and useful Improvements in the Processes of Manufacturing'Glycerin and Alkali Soaps, of which the following is a specification.

The usual processes of obtaining glycerin from fat consist in treatmentof soap liquor for that purpose, or in the decomposition of the fat. In both cases only a small yield of w more or less ,dilute, impure glycerin is obtained, and the glycerin requires purification and evaporation, entailing considerable ex- 'penditure for chemicals and heat.

- The object of this invention is to obtain,

by a simple process, a high yield of glycerin in a waterless state, together with a dry soap of quahty.

This result is obtainable by saponifying the fat with an equivalent proportion of alkali, then thoroughly and briskly dr ing it and powdering or grinding the d ried product, then extracting the glycerin with a. volatile, waterless, solvent which does not dissolve soap, and finally distilling ofl' the The saponification may with advantage be performed with highly concentrated alkali solution, or with dry alkali or alkali peroxide, so that there is a minimum of water to be got rid of. Itwill be obvious that by the same method glycerin can bejextracted from moist soap powder containing glycerin. a

The drying may/with advantage be performed by placing" the saponified mixture,

while still warm at the conclusion of the saponifyin -p,rocess,;in a good vacuum, and removing t e water byv suction.- The mix ture is by these means thoroughly loosened, and becomes sufiiciently hard to be easily ground. This hardening of a soap containing glycerin, so that it can be ground, is a surprising result, in view of the fact that alkali soaps produced by the us'ualmethods, 7 even if freefrom glycerin, retain 'aplastic I not capable of beingground. The lycerin cannot be dissolved g consistency even after long storage, and are out of the saponified n puc n n filed February 20,1923. Serial 116. 620,268.

mixture till it is wholly dry an granulated,

and this is also a fact not to be foreseen.

I Anyorganic volatile solvent, which does not dissolve'dry soap, may be used for ex- -tracting the glycerin, as for example acetone, methyl-ethyl-keton, methyl acetate,

ethyl acetate, methylal, absolute'ether and so on. Itis not necessary that the solvent dissolves the glycerin itself, as the lixiviation carries the glycerin with it.

By thedrying process, which can be per;

formed rapidly, the saponification products are obtained in a form in which they can be a separated easily in a pure state. This results in several advantages over the niethods hitherto in vogue.

Clear, waterless glycerinand concentrated, useful soap' are at once obtained. The

. cost of drying the glycerin is saved, and also "-0 the cost of chemicals for'purification and for salting outLthe-soap. ;Time is saved,

and also apparatus. The soap does not.re-' I ing it. The following is 'process. I

1 kg. of linseed oil are saponitied by stile ring with 25 kg. of 50%soda lye; As soon as asample taken'is found to be wholly soluble,

a' typical example of the 80 to C, The water runs off freely and soon the boiler is found to contain a ggre storage or centrifugal treatment for is,

the boiler is placed under a 10 vacuum,"'and the mixture is sucked dry, at'

dry R mus, loose mass, crumbly to the touch: This is cooled ground as finel as possible, and treated y for about an hour in an extractorwith. dry acetone. The acetone, 1 glycerin-containing solution is then completely removed from the extraction, and the acetone 15' then driven ofi, leaving clear faintly yellow glycerin, which can be bleached with carbon, The deglycerinized soap left in the extractor is in the form of nearly white, dry powder, and can be used as such, or pressed into cakes.

What I claim'as my invention and desire States is- The processofapi to secureby LettersPatent of the United reducing waterless l cerin and dry alk g y soap which consists; in

saponifying fat, to produce 51 mixture) of Ill witness whereof I have signed this the same, separating the glycerin glycerin and alkali soap,'thorough1y drying specification in the presence, of two witt e sa-ponified product in vacuo, inding nesses. j

a om the Dx. LUDWIG'SCHMIDT. soap by means of a. volatile glycerin extract- Witnesses: ing a ent which does not dissolve thesoatp,v ALEXANDER -01: SOTO, and dlstilling off the extracting agent. s v Awxzs PHILIPPOIF. 

